"""Scene-level settings shared by asset and shot files."""

import math

from ... import config
from ...core import Check, Issue, contexts


class UnitsCheck(Check):
    id = "units"
    label = "Units"
    description = "Unit system, unit scale and length unit follow the production specs."
    category = "Scene"
    contexts = contexts.ALL
    fix_description = "Set the production units"

    def run(self, ctx):
        units = ctx.scene.unit_settings
        if units.system != config.UNIT_SYSTEM:
            yield Issue(f"Unit system is {units.system}, expected {config.UNIT_SYSTEM}")
        if not math.isclose(units.scale_length, config.UNIT_SCALE_LENGTH, rel_tol=1e-6):
            yield Issue(f"Unit scale is {units.scale_length:g}, expected {config.UNIT_SCALE_LENGTH:g}")
        if config.UNIT_LENGTH and units.length_unit != config.UNIT_LENGTH:
            yield Issue(f"Length unit is {units.length_unit}, expected {config.UNIT_LENGTH}")

    def fix(self, ctx, issues):
        units = ctx.scene.unit_settings
        units.system = config.UNIT_SYSTEM
        units.scale_length = config.UNIT_SCALE_LENGTH
        if config.UNIT_LENGTH:
            units.length_unit = config.UNIT_LENGTH


class FilenameCheck(Check):
    id = "filename"
    label = "File name"
    description = "The file is saved and its name follows the naming pattern of the context."
    category = "File"
    contexts = contexts.ALL

    def run(self, ctx):
        if not ctx.filepath:
            yield Issue("The file has never been saved")
            return
        pattern = config.FILENAME_PATTERNS.get(ctx.context_id)
        if pattern and ctx.filename_match is None:
            yield Issue(f"'{ctx.filename}' does not match {pattern}")